Update CHANGELOG for May release (#113)

Author: JonathanCrd

CHANGELOG.md

@@ -1,15 +1,11 @@
 # Release History
 
-## 0.0.12 (Unreleased)
+## 0.0.12 (2025-05-05)
 
 ### Features Added
 
 - Azure Search Tools https://github.com/Azure/azure-mcp/pull/83
 
-### Breaking Changes
-
-### Bugs Fixed
-
 ### Other Changes
 
 - Arguments no longer echoed in response: https://github.com/Azure/azure-mcp/pull/79